Now when you meet the unbelievers in battle, smite their necks. Then when you have thoroughly subdued them, bind them firmly. Thereafter, set them free either by an act of grace or against ransom, until war shall lay down its burden. Thus [shall it be]. Had God so willed, He could have punished them Himself, but it is His will that He tests you all by means of one another. And as for those who are slain in God’s cause, never will He let their deeds go to waste.